1-43729682-T-C

Variant names:

• chr1-43729682-T-C
• rs4660260
• NM_006279.5:c.-30-6551T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_006279.5(ST3GAL3):​c.-30-6551T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.677 in 152,068 control chromosomes in the GnomAD database, including 35,217 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.68 (35217 hom., cov: 32)
• Consequence: ST3GAL3 NM_006279.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.266
• Publications: 8 publications found

Genes affected

ST3GAL3 (HGNC:10866): (ST3 beta-galactoside alpha-2,3-sialyltransferase 3) The protein encoded by this gene is a type II membrane protein that catalyzes the transfer of sialic acid from CMP-sialic acid to galactose-containing substrates. The encoded protein is normally found in the Golgi apparatus but can be proteolytically processed to a soluble form. This protein is a member of glycosyltransferase family 29. Mutations in this gene have been associated with a form of autosomal recessive nonsymdromic cognitive disability as well as infantile epileptic encephalopathy. Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

ST3GAL3 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 15

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• intellectual disability, autosomal recessive 12

  Inheritance: AR Classification: STRONG Submitted by: G2P
• complex neurodevelopmental disorder

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000284989 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.713 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ST3GAL3	NM_006279.5	c.-30-6551T>C		intron_variant	Intron 1 of 11	ENST00000347631.8	NP_006270.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ST3GAL3	ENST00000347631.8	c.-30-6551T>C		intron_variant	Intron 1 of 11	5	NM_006279.5	ENSP00000317192.6
ENSG00000284989	ENST00000645057.1	n.*1293-6551T>C		intron_variant	Intron 15 of 25			ENSP00000494063.1

Frequencies

GnomAD3 genomes AF: 0.677 AC: 102857 AN: 151950 Hom.: 35185 Cov.: 32

Gnomad AFR AF: 0.653

Gnomad AMI AF: 0.757

Gnomad AMR AF: 0.557

Gnomad ASJ AF: 0.630

Gnomad EAS AF: 0.725

Gnomad SAS AF: 0.541

Gnomad FIN AF: 0.727

Gnomad MID AF: 0.589

Gnomad NFE AF: 0.719

Gnomad OTH AF: 0.661

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.677 AC: 102940 AN: 152068 Hom.: 35217 Cov.: 32 AF XY: 0.673 AC XY: 50010 AN XY: 74334

African (AFR) AF: 0.653 AC: 27070 AN: 41456

American (AMR) AF: 0.557 AC: 8505 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.630 AC: 2186 AN: 3470

East Asian (EAS) AF: 0.725 AC: 3743 AN: 5164

South Asian (SAS) AF: 0.541 AC: 2611 AN: 4826

European-Finnish (FIN) AF: 0.727 AC: 7680 AN: 10566

Middle Eastern (MID) AF: 0.602 AC: 177 AN: 294

European-Non Finnish (NFE) AF: 0.719 AC: 48873 AN: 67998

Other (OTH) AF: 0.665 AC: 1405 AN: 2112

Alfa AF: 0.694 Hom.: 25668

Bravo AF: 0.668

Asia WGS AF: 0.634 AC: 2207 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	1.6
DANN	Benign	0.50
PhyloP100		-0.27
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs4660260; hg19: chr1-44195353;